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I am returning either boolean, string or integer value as an Object in Java. How to identify type of value once returned?

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You can use object.getClass() to get data type:

ArrayList<Object> list = ...;
for (Object o : list) {
    if (o.getClass().equals(Integer.class)) {
        handleInt((int)o);
    }
    else if (o.getClass().equals(String.class)) {
        handleString((String)o);
    }
    ...
}
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